DOBSON SKYWATCHER EXTENSIBLE 12" at Telescopiomania for the best price
 
all SKYWATCHER Dobson telescopes of retractable design do not need to be reassembled! 
SKYWATCHER's latest innovation in Dobson telescopes is the introduction of the new series of retractable (or extendable depending on whether they are to be stored or mounted for observation) Dobson telescopes that integrate a Crayford focuser as standard. This is the ultimate in performance, portability and large diameter. 
These elegant truss tubes were carefully designed to combine ease of use, extreme portability and consistent performance in a package that can be purchased for a very reasonable price. 
Unlike other truss tubes, SKYWATCHER's retractable Dobson tubes do not need to be disassembled for storage or transport. They consist of two compact pieces, one of which is mobile and can be retracted to shorten the length of the tube to make it a more compact and portable piece of equipment (the tube can be carried on one side and the Dobson base on the other). Both the action of folding and extending the tube is an operation that only takes a few seconds. 
Once the two pieces are assembled to go observing it is very easy to collimate the telescope and this collimation will be valid for the whole night! 
Technical Specifications: 
Optical Design: Newton Reflector 
Diameter: 305mm 
Focal Length: 1500mm 
Focal Ratio: f/4.9 
Maximum recommended magnification: 610x 
Stellar Magnitude Limit: 14.5 
Resolving Power: 0.39 arcseconds 
Eyepiece holder: 2" (with 1.25" adapter) 
Tube dimensions: 450 x (920mm-1400mm) 
Weight: 21Kg 
Eyepieces: SP10 and SP26 
Finder: 8x50 
Mount: 12" retractable Dobson (Collapsible)